Mom's Very Rich Shortbread

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   ["Heat oven to 350 degrees F.", "Lightly rub a stick of butter over a large cookie sheet.", "Cream butter, sugar, vanilla and salt together.", "Making sure flour is sifted, add the first 2 cups slowly.", "Another 1/4 cup may be added if the weather is damp or the dough seems extremely soft.", "This is supposed to be a very soft dough, so use extra flour sparingly.", "Using a heaping teaspoonful, form into a ball.", "Take care not to roll them too much in your hands, so the dough doesn't become ""tough"".", "Place cookies about two inches apart on the sheet.", "Flatten slightly with a glass dipped in powdered sugar.", "Bake for 12 to 15 minutes, or just until the edges begin to brown.", "Yield depends on how ""heaping"" your teaspoons are!"]

* Per serving · 4 servings · Values may vary.